sparklxx sparklxx

22-11-2020
Mathematics

contestada

help!!! please i don’t understand

help please i dont understand class=

Respuesta :

veronicaysemin veronicaysemin

22-11-2020

Answer:

x = 10

Step-by-step explanation:

DEC is a right angle, right angles equal 90 degrees

so this means 7x + 20 needs to equal 90

7 x 10 + 20 = 90

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